свойство closed

Future<void> closed

Реализация

Future<void> get closed => promiseToFuture<void>(JS("", "#.closed", this));

© 2012 the Dart project authors
Licensed under the BSD 3-Clause "New" or "Revised" License.
https://api.dart.dev/stable/2.18.5/dart-html/MediaKeySession/closed.html